Just purchased a 858c HD DI for the bow. Is the transducer that came with the unit okay for trolling motor mount as far as frequencies go. Most of my fishing is 50' or under. My understanding of transducers is about as good as my understanding of electricity. After a point, I just don't get it.
I know the optional transducer has a 83kz setting. I don't understand the benefit or drawbacks.